{"id":97156,"date":"2024-10-20T15:28:16","date_gmt":"2024-10-20T07:28:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/97156\/"},"modified":"2024-10-20T15:28:16","modified_gmt":"2024-10-20T07:28:16","slug":"qt%e6%95%b8%e6%93%9a%e5%ba%ab%e6%93%8d%e4%bd%9c%ef%bc%9a%e5%a6%82%e4%bd%95%e5%be%9e%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%8f%96%e5%87%ba%e6%95%b8%e6%93%9a%ef%bc%9f-qt%e5%8f%96%e5%87%ba%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/97156\/","title":{"rendered":"Qt\u6578\u64da\u5eab\u64cd\u4f5c\uff1a\u5982\u4f55\u5f9e\u6578\u64da\u5eab\u4e2d\u53d6\u51fa\u6578\u64da\uff1f (qt\u53d6\u51fa\u6578\u64da\u5eab\u6578\u64da)"},"content":{"rendered":"

Qt\u6578\u64da\u5eab\u64cd\u4f5c\uff1a\u5982\u4f55\u5f9e\u6578\u64da\u5eab\u4e2d\u53d6\u51fa\u6578\u64da\uff1f<\/h1>\n

\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5f0f\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u4f7f\u7528\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u666e\u904d\u3002Qt\u4f5c\u70ba\u4e00\u500b\u8de8\u5e73\u53f0\u7684\u61c9\u7528\u7a0b\u5f0f\u6846\u67b6\uff0c\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u6578\u64da\u5eab\u64cd\u4f5c\u529f\u80fd\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528Qt\u5f9e\u6578\u64da\u5eab\u4e2d\u53d6\u51fa\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n

Qt\u7684\u6578\u64da\u5eab\u6a21\u7d44<\/h2>\n

Qt\u63d0\u4f9b\u4e86\u4e00\u500b\u540d\u70baQtSql\u7684\u6a21\u7d44\uff0c\u5c08\u9580\u7528\u65bc\u6578\u64da\u5eab\u7684\u64cd\u4f5c\u3002\u9019\u500b\u6a21\u7d44\u652f\u6301\u591a\u7a2e\u6578\u64da\u5eab\uff0c\u5305\u62ecSQLite\u3001MySQL\u3001PostgreSQL\u7b49\u3002\u4f7f\u7528QtSql\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u9023\u63a5\u6578\u64da\u5eab\u3001\u57f7\u884c\u67e5\u8a62\u4ee5\u53ca\u8655\u7406\u7d50\u679c\u96c6\u3002<\/p>\n

\u9023\u63a5\u6578\u64da\u5eab<\/h2>\n

\u5728\u5f9e\u6578\u64da\u5eab\u4e2d\u53d6\u51fa\u6578\u64da\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u5efa\u7acb\u8207\u6578\u64da\u5eab\u7684\u9023\u63a5\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528Qt\u9023\u63a5SQLite\u6578\u64da\u5eab\u7684\u793a\u4f8b\uff1a<\/p>\n

\n#include <QSqlDatabase>\n#include <QSqlError>\n#include <QSqlQuery>\n#include <QDebug>\n\n\/\/ \u5275\u5efa\u6578\u64da\u5eab\u9023\u63a5\nQSqlDatabase db = QSqlDatabase::addDatabase(\"QSQLITE\");\ndb.setDatabaseName(\"example.db\");\n\nif (!db.open()) {\n    qDebug() << \"\u7121\u6cd5\u9023\u63a5\u5230\u6578\u64da\u5eab\uff1a\" << db.lastError().text();\n} else {\n    qDebug() << \"\u6210\u529f\u9023\u63a5\u5230\u6578\u64da\u5eab\uff01\";\n}\n<\/code><\/pre>\n
\u57f7\u884c\u67e5\u8a62<\/h2>\n
\u4e00\u65e6\u6210\u529f\u9023\u63a5\u5230\u6578\u64da\u5eab\uff0c\u5c31\u53ef\u4ee5\u57f7\u884cSQL\u67e5\u8a62\u4f86\u53d6\u51fa\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u67e5\u8a62\u6578\u64da\u7684\u793a\u4f8b\uff1a<\/p>\n
\nQSqlQuery query(\"SELECT * FROM users\");\n\nwhile (query.next()) {\n    QString name = query.value(0).toString();\n    int age = query.value(1).toInt();\n    qDebug() << \"\u59d3\u540d\uff1a\" << name << \", \u5e74\u9f61\uff1a\" << age;\n}\n<\/code><\/pre>\n
\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5f9e\u540d\u70ba\u201cusers\u201d\u7684\u8868\u4e2d\u9078\u53d6\u6240\u6709\u7684\u6578\u64da\uff0c\u4e26\u4f7f\u7528`query.next()`\u65b9\u6cd5\u9010\u884c\u904d\u6b77\u7d50\u679c\u96c6\u3002`query.value(index)`\u65b9\u6cd5\u7528\u65bc\u7372\u53d6\u6307\u5b9a\u5217\u7684\u6578\u64da\u3002<\/p>\n
\u8655\u7406\u67e5\u8a62\u7d50\u679c<\/h2>\n
\u5728\u8655\u7406\u67e5\u8a62\u7d50\u679c\u6642\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6839\u64da\u9700\u8981\u9032\u884c\u5404\u7a2e\u64cd\u4f5c\uff0c\u4f8b\u5982\u5c07\u6578\u64da\u986f\u793a\u5728\u7528\u6236\u754c\u9762\u4e0a\u6216\u9032\u884c\u9032\u4e00\u6b65\u7684\u6578\u64da\u8655\u7406\u3002\u4ee5\u4e0b\u662f\u5c07\u67e5\u8a62\u7d50\u679c\u986f\u793a\u5728QTableWidget\u4e2d\u7684\u793a\u4f8b\uff1a<\/p>\n
\nQTableWidget *tableWidget = new QTableWidget();\ntableWidget->setRowCount(query.size());\ntableWidget->setColumnCount(2);\ntableWidget->setHorizontalHeaderLabels(QStringList() << \"\u59d3\u540d\" << \"\u5e74\u9f61\");\n\nint row = 0;\nwhile (query.next()) {\n    tableWidget->setItem(row, 0, new QTableWidgetItem(query.value(0).toString()));\n    tableWidget->setItem(row, 1, new QTableWidgetItem(QString::number(query.value(1).toInt())));\n    row++;\n}\n<\/code><\/pre>\n
\u932f\u8aa4\u8655\u7406<\/h2>\n
\u5728\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u6642\uff0c\u932f\u8aa4\u8655\u7406\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002Qt\u63d0\u4f9b\u4e86`QSqlError`\u985e\u4f86\u5e6b\u52a9\u958b\u767c\u8005\u6355\u7372\u548c\u8655\u7406\u932f\u8aa4\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u6aa2\u67e5\u67e5\u8a62\u662f\u5426\u6210\u529f\u7684\u793a\u4f8b\uff1a<\/p>\n
\nif (!query.exec()) {\n    qDebug() << \"\u67e5\u8a62\u5931\u6557\uff1a\" << query.lastError().text();\n}\n<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u4f7f\u7528Qt\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u662f\u4e00\u500b\u76f8\u5c0d\u7c21\u55ae\u7684\u904e\u7a0b\uff0c\u5f9e\u9023\u63a5\u6578\u64da\u5eab\u5230\u57f7\u884c\u67e5\u8a62\u548c\u8655\u7406\u7d50\u679c\uff0cQt\u90fd\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u652f\u6301\u3002\u958b\u767c\u8005\u53ef\u4ee5\u5229\u7528\u9019\u4e9b\u529f\u80fd\u4f86\u69cb\u5efa\u9ad8\u6548\u7684\u61c9\u7528\u7a0b\u5f0f\uff0c\u4e26\u8f15\u9b06\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u53d6\u51fa\u6240\u9700\u7684\u6578\u64da\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u90e8\u7f72\u60a8\u7684Qt\u61c9\u7528\u7a0b\u5f0f\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 \u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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